Hydrocarbons: Alkanes, Alkenes, Alkynes - Applications
Q. What is the common use of alkenes in the industry?
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A.
Fuel
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B.
Plastics production
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C.
Solvents
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D.
Food additives
Solution
Alkenes are commonly used in the production of plastics, such as polyethylene.
Correct Answer: B — Plastics production
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Q. What is the functional group present in alkenes?
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A.
Alcohol
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B.
Aldehyde
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C.
Alkene
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D.
Alkyne
Solution
The functional group present in alkenes is the alkene group, characterized by a carbon-carbon double bond.
Correct Answer: C — Alkene
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Q. What is the IUPAC name for the compound with the structure CH≡C-CH2-CH3?
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A.
1-butyne
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B.
2-butyne
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C.
1-pentyne
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D.
3-butyne
Solution
The compound is 1-butyne, as the triple bond is between the first and second carbon.
Correct Answer: A — 1-butyne
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Q. What is the main application of alkenes in the industry?
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A.
Fuel
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B.
Plastics
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C.
Solvents
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D.
Detergents
Solution
Alkenes are primarily used in the production of plastics, such as polyethylene.
Correct Answer: B — Plastics
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Q. What is the main functional group in alkenes?
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A.
Alcohol
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B.
Aldehyde
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C.
Alkene
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D.
Alkyne
Solution
The main functional group in alkenes is the alkene group, characterized by a carbon-carbon double bond.
Correct Answer: C — Alkene
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Q. What type of reaction occurs when an alkene reacts with HBr?
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A.
Addition reaction
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B.
Elimination reaction
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C.
Substitution reaction
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D.
Redox reaction
Solution
The reaction of an alkene with HBr is an addition reaction, where HBr adds across the double bond.
Correct Answer: A — Addition reaction
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Q. Which of the following is the correct stereochemical descriptor for 2-butene with the double bond in the trans configuration?
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A.
cis-2-butene
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B.
trans-2-butene
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C.
1-butene
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D.
butyne
Solution
The correct descriptor for 2-butene with the double bond in the trans configuration is trans-2-butene.
Correct Answer: B — trans-2-butene
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Q. Which reaction mechanism is primarily involved in the addition of HBr to an alkene?
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A.
Electrophilic addition
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B.
Nucleophilic substitution
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C.
Radical substitution
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D.
Elimination
Solution
The addition of HBr to an alkene occurs via an electrophilic addition mechanism.
Correct Answer: A — Electrophilic addition
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